Question

12 hr 24 hr 48 hr 3. CHORDATE DEVELOPMENT a. Indicate the plane (polar or equatorial) of the cleavage divisions. 1. First division 2. Second division 3. Third division b. Are the planes the same as in the sea urchin? c. Why are the cells formed in the vegetal hemisphere larger than those of the animal hemisphere? d. In which hemisphere does gastrulation occur? Is this the same site as in the sea urchin? c. Indicate the embryonic tissue that forms these structures. 1. Embryonic gut 2. Mesodermal pouches 3. Notochord 4. Neural tube 5. Lining of the coelom f. From your slide, draw a frog neurula in cross-section. Label the pertinent parts. Color your drawing as follows: ectoderm-blue; neural tube-green; mesoderm-red; endoderm-yellow. 8. What similarities have you observed in embryos of the sea urchin, amphioxus, and frog?